How to multiply a 2 digit number by 30

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

How many verticies does a triangular prims have

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x